Adjustment Of Video System; Video Level Adjustment; Component Video Output Level Adjustment; Checking S Video Output S-Y - Sony DVP-CX875P Service Manual

7-2. ADJUSTMENT OF VIDEO SYSTEM

1. Video Level Adjustment (MB-107 BOARD)
<Purpose>
This adjustment is made to satisfy the NTSC standard, and if not
adjusted correctly, the brightness will be too large or small.
Mode Video level adjustment in test mode
Signal Color bars
VIDEO OUTPUT connector
Test point
(75 Ω terminated)
Instrument Oscilloscope
Adjusting element RV601
Specification 1.00
Adjusting method:
1) In the test mode initial menu "6" Video Level Adjustment, set
so that color bars are generated.
2) Adjust the RV601 to attain 1.00
Figure 7-1

2. Component Video Output Level Adjustment

(MB-107 BOARD)
<Purpose>
This adjustments component video output. If it is incorrect, cor-
rect brightness will not be attained when connected to, for instance,
projector.
Mode Video level adjustment in test mode
Signal Color bars
COMPONENT VIDEO OUT (Y)
Test point
connector (75 Ω terminated)
Instrument Oscilloscope
Adjusting element RV602
Specification 1.00
Adjusting method:
1) In the test mode initial menu "6" Video Level Adjustment, set
so that color bars are generated.
2) Adjust the RV602 to attain 1.00
Figure 7-2
+0.04
Vp-p
–0.02
+ 0.04
Vp-p.
– 0.02
+0.04
1.00 Vp-p
–0.02
+ 0.04
Vp-p
– 0.02
+ 0.04
Vp-p
– 0.02
+ 0.04
1.00
– 0.02

3. Checking S Video Output S-Y

<Purpose>
Check S-terminal video output. If it is incorrect, pictures will not
be displayed correctly in spite of connection to the TV with a S-
terminal cable.
Mode
Signal
Test point
Instrument
Specification
Checking method:
1) In the test mode initial menu "6" Video Level Adjustment, set
so that color bars are generated.
2) Confirm that the S-Y level is 1.00 ± 0.05 Vp-p.

4. Checking S Video Output S-C

<Purpose>
This checks whether the S-C satisfies the NTSC Standard. If it is
not correct, the colors will be too dark or light.
Mode
Signal
Test point
Instrument
Specification
Checking method:
1) In the test mode initial menu "6" Video Level Adjustment, set
so that color bars are generated.
2) Confirm that the S-C burst is "A".
Vp-p
7-2
Video level adjustment in test mode
Color bars
S VIDEO OUT (S-Y) connector
(75 Ω terminated)
Oscilloscope
1.00 ± 0.05 Vp-p
1.00 ± 0.05 Vp-p
Figure 7-3
Video level adjustment in test mode
Color bars
S VIDEO OUT (S-C) connector
(75 Ω terminated)
Oscilloscope
A = 286 ± 30 mVp-p (NTSC)
A
Figure 7-4